polymodel.py

from appengine_django import models
from google.appengine.ext import db
from google.appengine.ext.db import polymodel

class Timeline(polymodel.PolyModel):
    """
    Usage::
        user = users.get_current_user()
        message = 'test'
        timeline = Timeline(author = user, message = message)
        timeline.save()
    """
    author = db.UserProperty()
    message = db.StringProperty(_('message'), required=True)
    photo = db.IntegerProperty()

class ImageTimeline(Timeline):
    # image
    data = db.BlobProperty(required=True)
    format = db.StringProperty(required=True)

    @classmethod
    def class_name(cls):
        return 'Photo'

from google.appengine.api import users, images
from django.core.files.uploadedfile import SimpleUploadedFile as UploadedFile

file = request.FILES['image']
format = file.content_type
data = images.Image(file.read())._image_data
author = users.get_current_user()
image = ImageTimeline(author = author, message = 'test', data = data, format = format)
image.put()

# get photos
imagetimelines = Timeline.all().filter('class =', 'Photo')